1996 Geo Tracker gas cap has to be exact fuel pressure?

1996 Geo Tracker. Started having running problems like it was starving for fuel. Replaced the gas cap and fuel filter. New driver (its a tow behind for small business) lost the new gas cap and put the old one back on. I don't think it's the same gas cap that goes with it. Now it's having problems on the very next time it was took out. Seems aweful coincidental that the new gas cap seemed to line out the problem and now that it was lost and old one back on, it's having running issues. Will the gas cap cause this problem and if so, how do we get it lined back out on the pressure and get it going again after new cap is on? I have a driver stuck in Kentucky. HELP!

Old post. but this is common on ALL EFI CARS.great question and is very easy.btw one of the best posts on the forum best of 1300.the gas cap must have the proper vacuum breaker (ask STANT for one) if missing the cooling fuel will pull and illegal vacuuum and the gas tank will implode (crush) I have a nice photo of same car doing that.this vacuum also stalls the fuel pump, as the vacuum builds.this happens on cooling day not getting hotter day.to prove this drive with the cap loose and ignore the ECU check light for EVAP failure. (pressure test fails)loosen the cap key on, 3 times to 5 times to build pump pressure, the pump only runs key on for 3 sec. then start it up.the other proof of lost fuel is the test fuel test. (spray)

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low fuel pressure tops my list.does the cluster lamp CEL glow , keythen go out, running (idling) it mustof not that means scan me , if in usa, are you?in canada its different.this engine makes power in limhome mode.so my guess , low fuel pressure. the FPRs are failing nowthis old, btwit can stick open and pressure drops to 15psi and not 35,45psi.btw , that was guess, and as most guesses, useless.i do the tests, and least the results tell me truth.i can rattle off, 10 top reasons or or even 50 , inside engine.Low power has many causes, does it help guessing?there are like 1 to 10 tests, to do and bam, cause.folks that love to guess, send endless useless cash.

I i can tick off many top causesyour engine dont read my list it does what it wants. fate, miles, abuse, bad service, endless this topic. truely.1: needs a tuneup.,2: compression (cyl) low, its and old car.3: maf dirty4: low fuel pressure FPR , is toasted.5: cat melted.6: huge vacuum leak , in the main induction and Air fuel ratio goes super lean.that top pipe for air on top engine loves to failand large number of ways, and all LEAK AIR.I seen over 10 like this. even broken mount to it and sucking air like mad.those are the top fails as is a slipped timing beltbut that is part of the tuneup, its replaced at 60kmiles, if you skip this service point it fails.it slips and compressing drops by 1/2 and so does power. seen 100s like that.why not just get car serviced if you dont own mech. tools?

if the 16v engine, says that on top, of valve cover
it has wells spark wells are they full of oil, that is the 60k tuneup
step that calls out valve lash checks and new gasket there.'
if they fill with water or oil , that will make starting hard.
there are 50 more ways, we dont guess, the tests and tools are easy and cheap.
got tools?

hard starts, ? basics.

low battery (for 3 reasons) = low spark energy.

low compression, skipping the 60k means the cam belt slipped.

bad spark , not doing a full 60k tuneup.

bad fueling. (too little or too much) "complex set of tests but scan it first"

Sounds like something is letting the fuel pressure bleed off after the motor is turned off. Can you monitor the pressure? (Requires adapters and gauge.) Trouble shooting will be a little different between the 8 valve or 16 valve motors. (The fuel injecton systems are different.) You might want to go to a Suzuki Forum. (Your Tracker is a rebadged Suzuki.)

Is the fuel pump running? When you turn the key to the run position (the dash lights come on), you should hear a humming sound coming from the gas tank for a few seconds. Thats the fuel pump running to pressurize the system before starting. It's kind of hard to hear, so get a friend to sit in the car while you lay on the ground near the gas tank. Have them turn on the key and listen. No hum means the fuel pump isnt working.